问题描述：
people who go abroad should know they r_the interests of our country
people who go abroad should know they r___the interests of our country
C___ science is very popular in big cities nowadays
People in less -d___country still haven't got enough food to eat
people who go abroad should know they r___the interests of our country
C___ science is very popular in big cities nowadays
People in less -d___country still haven't got enough food to eat
问题解答：
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